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Segmented Information - Schedule of Gross Revenue by Services (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of products and services [line items] |  |
Gross revenue | $ 4,283.8 | $ 4,028.7
Consulting Services [member] | Buildings Services [member] |  |
Disclosure of products and services [line items] |  |
Gross revenue | 944.5 | 898.1
Consulting Services [member] | Energy and Resources Services [member] |  |
Disclosure of products and services [line items] |  |
Gross revenue | 591.7 | 479.2
Consulting Services [member] | Environmental Services [member] |  |
Disclosure of products and services [line items] |  |
Gross revenue | 682.8 | 678.1
Consulting Services [member] | Infrastructure [member] |  |
Disclosure of products and services [line items] |  |
Gross revenue | 1,157.6 | 1,090.4
Consulting Services [member] | Water Services [member] |  |
Disclosure of products and services [line items] |  |
Gross revenue | $ 907.2 | $ 882.9

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